Standardized Enthalpies and Entropies

Standardized enthalpies and entropies for some common substances

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Standardized enthalpies and entropies of some common substances:

Substance	Entropy - s -		Enthalpy - h -
Substance	Btu/lbmole R	J/gmole K	Btu/lbmole	J/gmole
Acetylene C₂H₂	47.97	200.82	97,495	226,757
Benzene C₆H₆	64.3	269.21	35,653	82,923
n-Butane C₄H₁₀	74.1	310.03	-53,627	-124,727
Carbon Dioxide CO₂	51.03	213.66	-169,183	-393,492
Carbon Monoxide CO	47.3	197.92	-47,517	-110,516
Ethane C₂H₆	54.8	229.48	-36,401	-84,662
Hydrogen H₂	31.2	130.60	0	0
Methane CH₄	44.5	186.19	-32,179	-74,843
Nitrogen N₂	45.8	191.56	0	0
Oxygen O₂	48.99	205.09	0	0
Propane C₃H₈	64.47	269.92	-44,647	-103,848
Water H₂O	16.72	70.00	-122,976	-286,022

equilibrium states at 25^oC (77^oF) and 1 atm

Go to Standard state and Standard enthalpy of formation for listing of standard enthalpy of formation and standard entrypy for more than 370 inorganic substances.

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